华侨和港澳台学生每年可买()次学生票。
A.2;
B.4;
C.6;
D.8。
参考答案:B
(1)(-4)-(+13)+(-5)-(-9)
(2)(-48)÷8-(-25)×(-6)
(3)-24+(-3)2十5×(-6)
(4)-14+(-1)5-(4÷2)3-4÷23
It is not enough only________ the rules of grammar if you want to learn English well.
A.keeping in the mind
B.to keep in mind
C.to keep in your mind
D.keeping in your mind